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- PDB-7jy6: Analysis of a strand exchange reaction with a mini filament of 9-... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7jy6 | ||||||
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Title | Analysis of a strand exchange reaction with a mini filament of 9-RecA, oligo(dT)27 primary ssDNA, non-homologous 120 bp dsDNA and ATPgammaS | ||||||
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![]() | DNA BINDING PROTEIN/DNA / Recombination / DNA repair / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex | ||||||
Function / homology | ![]() DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / response to ionizing radiation / SOS response / ATP-dependent activity, acting on DNA / translesion synthesis / cell motility / single-stranded DNA binding ...DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / response to ionizing radiation / SOS response / ATP-dependent activity, acting on DNA / translesion synthesis / cell motility / single-stranded DNA binding / DNA-binding transcription factor binding / DNA recombination / damaged DNA binding / DNA repair / DNA damage response / ATP hydrolysis activity / ATP binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å | ||||||
![]() | Pavletich, N.P. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Mechanism of strand exchange from RecA-DNA synaptic and D-loop structures. Authors: Haijuan Yang / Chun Zhou / Ankita Dhar / Nikola P Pavletich / ![]() ![]() Abstract: The strand-exchange reaction is central to homologous recombination. It is catalysed by the RecA family of ATPases, which form a helical filament with single-stranded DNA (ssDNA) and ATP. This ...The strand-exchange reaction is central to homologous recombination. It is catalysed by the RecA family of ATPases, which form a helical filament with single-stranded DNA (ssDNA) and ATP. This filament binds to a donor double-stranded DNA (dsDNA) to form synaptic filaments, which search for homology and then catalyse the exchange of the complementary strand, forming either a new heteroduplex or-if homology is limited-a D-loop. How synaptic filaments form, search for homology and catalyse strand exchange is poorly understood. Here we report the cryo-electron microscopy analysis of synaptic mini-filaments with both non-complementary and partially complementary dsDNA, and structures of RecA-D-loop complexes containing a 10- or a 12-base-pair heteroduplex. The C-terminal domain of RecA binds to dsDNA and directs it to the RecA L2 loop, which inserts into and opens up the duplex. The opening propagates through RecA sequestering the homologous strand at a secondary DNA-binding site, which frees the complementary strand to sample pairing with the ssDNA. At each RecA step, there is a roughly 20% probability that duplex opening will terminate and the as-yet-unopened dsDNA portion will bind to another C-terminal domain. Homology suppresses this process, through the cooperation of heteroduplex pairing with the binding of ssDNA to the secondary site, to extend dsDNA opening. This mechanism locally limits the length of ssDNA sampled for pairing if homology is not encountered, and could allow for the formation of multiple, widely separated synapses on the donor dsDNA, which would increase the likelihood of encountering homology. These findings provide key mechanistic insights into homologous recombination. | ||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.2 MB | Display | ![]() |
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PDB format | ![]() | 1.9 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 22522MC ![]() 7jy7C ![]() 7jy8C ![]() 7jy9C M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 35960.281 Da / Num. of mol.: 9 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #2: DNA chain | | Mass: 8168.248 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() #3: DNA chain | | Mass: 13643.719 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() #4: Chemical | ChemComp-MG / #5: Chemical | ChemComp-AGS / Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Ensemble of products of a strand exchange reaction with non-homologous 120 bp dsDNA and ATPgammaS Type: COMPLEX / Entity ID: #1-#3 / Source: MULTIPLE SOURCES |
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Source (natural) | Organism: ![]() ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 54 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: REFMAC / Version: 5.8.0258 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1592037 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 3CMW Accession code: 3CMW / Source name: PDB / Type: experimental model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 2.5→195.12 Å / Cor.coef. Fo:Fc: 0.862 / SU B: 11.566 / SU ML: 0.111 / ESU R: 0.201 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1 Å / Solvent model: MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 35.548 Å2
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Refinement step | Cycle: 1 / Total: 24050 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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